function initialize() {
    var mapOptions = {
        center: new google.maps.LatLng(39, -97),
        zoom: 5,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);

    var pinput = document.getElementById('PickupLocation');
    var pautocomplete = new google.maps.places.Autocomplete(pinput);
    pautocomplete.bindTo('bounds', map);

    var dropoffinput = document.getElementById('DropoffLocation');
    var dropoffautocomplete = new google.maps.places.Autocomplete(dropoffinput);
    dropoffautocomplete.bindTo('bounds', map);

    var rpinput = document.getElementById('ReturnPickupLocation');
    var rpautocomplete = new google.maps.places.Autocomplete(rpinput);
    rpautocomplete.bindTo('bounds', map);

    var rdropoffinput = document.getElementById('ReturnDropoffLocation');
    var rdropoffautocomplete = new google.maps.places.Autocomplete(rdropoffinput);
    rdropoffautocomplete.bindTo('bounds', map);
}
google.maps.event.addDomListener(window, 'load', initialize);